Handle for pneumatic tools.



PATENTED APR. 26, 1904.

0. H, PEGK. HANDLE FOR PNEUMATIC TOOLS.

APPLIGATION I'ILED JAN. 16, 1904.

H0 MODIBL.

V MENTOR wnwassas fi KM 4,4

,A: ATTORNEYS;

UNITED STATES Patented April 26, 1904.

P TENT OFFICE.

oAIn PEoK, or WAVERLY, NEW YORK, ASSIGNOR 'To IMPERIAL PNEUMATIG TOOLCOMPANY, or ATHENS, PENNSYLVANIA, A COR- POBA'IION or NEW YORK.

. HANDLE FOR PNEUMATIC TOOLS- SPECIFICATION forming part of LettersPatent No. 758,100, dated April 26, 1904.

application filed J annarylii, 1904.- Seria1N0.189,331. "(No model.)

To all whom it may concern:

Be it known that I, CAID H. PEoK, acitizen ofthe United States ofAmerica, and aresident of WVaverly, county of Tioga, State of New York,have invented certain new and useful Improvements. in Handles forPneumatic Tools, of which the following is a specifica-. tion, referencebeing had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in pneumatic tools, andparticularly to handles therefor.

The term i handle is often applied to that portion of pneumatic toolscomprising the head-block and the handle proper, and in the title andgeneral descriptionof this invention I have adopted and applied the termas a mat-- ter of convenience, while in the more precise claims I havecarefully differentiated between the head-block and the handle proper.

In the most approved form of pneumatic tools at present in use it iscustomary to provide means for controlling passage of motive fluid tothe pneumatic tool .by means of an operating-lever having a thumb-piecein prox i'mityto the grasping portion of the handle, so that operationof the tool may be readily controlled by movement of thelthumb ofthehand supporting the tool.

In mypresent invention I provide the headblock With an inlet-duct andmount avalve for controlling the inlet-duct in the said headblock. Ithen provide the grasping portion of the handle with an operating-leverand problock, so that the valve and the valve-seat I may be readilyremoved and replaced when desired. The Valve is of the puppet for1nhaving a puppet-head arranged toengage a valve-face to which it isfitted, and the por-' tion of the valve-stem immediately beneath thepuppet-head is taperechwhile the portion of the valve-seatsurrounding itis cylindrical. By this arrangement a very sensitive graduation ofsupply in the movements of the valve is obtained in a very simplemanner. The

.piece facing outwardly. The front portion of the operating-lever has acam-facefor en- I gaging the rear end of the intermediate lever. Theintermediate lever is pivoted in a slotted portion of the shank of thehandle or that part of the handle which connects the graspQ ing portionwith the head-block. By prop- ,erly shaping the cam-face of the leverthe valve may be controlledto the best advantage I with the minimumexertion. arranged as to balance,'so far as fluid-pres sure isconcerned, while being operated, so that there'is no resistance from themotive .fluid upon the operating-lever at such times.

' "The object of my invention is to improve and simplify pneumatictool-handles, render the parts easy of access and simple'of manufacture,to improve the sensitiveness of the jvalve control, and to reduce thelength of the air-inlet duct to a minimum. r

To these ends my invention consists 1n certain details of constructionand combination ofoperating-lever is arranged in a slot in the graspingportion of the handie with the thumb The valve isso parts, as willhereinafter be fully pointed out.

I will now proceed to describe a device embodying my invention and willthen point out the novel features in claims.

In the drawings, Figure 1 is a view inside elevation of a pneumatictool-handle embody- .ing my invention. Fig. 2 is a view 'in centralvertical section therethrough. Fig; 3 is an end view of same.

The handle as a whole comprises a head- 'block 1, having an externalscrew-threaded extension 2, by which it may be secured to the toolproper, a grasping portion 3, and a shank 1. The head-block 1 isrecessed at 5 to form a Valve-chamber and receive 'a valveseat 6, fittedthereto and secured in place by a screw-threaded connection 7. A boss 8projects rearwardly from the head-block and is arranged to receive theend of a flexible hose arranged for conveying motive fluid to the tool.The inlet-duct 9 passes through the boss into the valve-chamber 5. Thehead-block is bored out at 10, such bore opening into the recess 5, towhich the valve-seat is fitted at one sideand at the other sidecommunicating with a smaller bore 11, arranged for receiving and guidingthe stem of the controllingvalve. The controlling-valve comprises apuppet-valve head 12, fitted to a suitable valveface in the valve-seat6, a stem 13 projecting rearwardly of said valve-face, a tapered neck 14immediately in front of said valve-face, and a valve-stem 15 fitted tothe bore 11. The valve-stem 15 penetrates to the exterior of the bore 11into a slot 16 transverse of the head block and extending longitudinallythrough the shank 4.. A similar slot 17 is arranged in the graspingportion of the handle 3, and an operating-lever 18 is pivotally mountedat 19in said slot 17. The operating-lever 18 has a thumb-piece 20, whichprojects rearwardly of the handle, an operating cam-face 21, and aportion 22, arranged to abut against the wall of the slot 17, so as toform a stop, limiting the movement of the lever in one direction. Anintermediate lever 23 is pivotally mounted at 24 in the slot 16, therear end of the lever engaging the camface 21 of the operating-lever 18and the front end of the lever resting against the outer end of thevalve-stem 15.

When the grasping portion of the handle is grasped in the usual way, thethumb will naturally rest upon the thumb-piece 20 of the operating-lever18. A slight pressure of the thumb will cause the cam-face 21 to so actupon the intermediate lever 23 as to raise the rear end, depress theforward end, and hence depress the controlling-valve, so as to withdrawthe valve-face 12 from its seat. Because of the tapered formation of theneck 14 the first movement of the controlling-valve will only permit asmall quantity of motive fluid to pass. Further pressure upon thethumb-piece will cause the valve to be opened wider and wider, whereby agraduated admission is obtained, giving easily and readily the requiredamount of admission. A spring 25 opposes movement of the valve and tendsto return same to its seat. It will be noted that the valve is balancedas to fluid-pressure while being operated, so that there will be notendency for the motive fluid itself to force the valve to its seat, alight spring only being employed for this purpose. The action of thevalve by reason of this will be very much more sensitive and delicatethan if opposed by the motive fluid.

What I claim is- 1. In a pneumatic tool the combination with ahead-block having an air-inlet duct therein, of a valve mounted in saidhead-block controlling said air-duct, a handle connected to saidhead-block, an operating-lever mounted in said handle and having awedge-action camface, and an intermediate lever between the stem of saidvalve and said operating-lever, arranged to engage said cam-face and beoperated by the wedge action thereof.

2. In a pneumatic tool the combination with a head-block having anair-inlet duct therein, of a valve mounted in said head-blockcontrolling said air-duct, a handle connected to said head-block, anoperating-lever mounted in said handle and having a wedge-actioncamface, and an intermediate lever between the stem of said valve andsaid operating-lever, arranged to engage said cam-face, the coactingends of the said levers arranged to move in opposite directions whenoperated.

3. In a pneumatic tool the combination with a head-block having anopening for receiving a valve and stem, extending all the way therethrough from one side to the other, said opening adapted at one end toreceive a valve-stem, and enlarged at the other end to form avalvechamber, and having an airinlet duct therein entering laterallyfrom the exterior thereof into the valve-chamber end of the openingtherein, of a valve arranged in said valvechamber and having a stemfitted to the said opening in the head-block and valve-operating meansengaging the protruding end of said valve-stem substantially as setforth.

4. In a pneumatic tool the combination with a head-block having anopening for receiving a valve and stem, extending all the waytherethrough from one side to the other, said opening adapted at one endto receive a valve-stem, and enlarged at the other end to form avalvechamber, and having an air-inlet duct therein entering laterallyfrom the exterior thereof into the valve-chamber end of the openingtherein, of a valve-seat removably fitted to said valvechamber, a valvein said valvechamber fitted to said valve-seat and having a valve-stemfitted to the said opening in the head-block, and valve-operating meansengaging the protruding ends of said valve-stem substantially as setforth.

5. In a pneumatic tool the combination with a head-block having anair-inlet duct therein, of a puppet-valve for 'controlling admissionthrough said inlet-duct, said puppet-valve having a guiding-stem and atapered neck, said tapered neck fitted to a substantially cylindricalbore in the valve-seat, and valve-op- IIC erating means for engaging thesaid valvefor both saidstems being open to the atmos- Y stem.

6. In a pneumatic tool the combination with a head-block having anair-inlet duct therein, of a puppet-valve for controlling admissionthrough said inlet duct, said puppet-valve having a front and rear stemguided in the said head-block, the outer ends of the guides phere. 1o

\ In Witness whereof I have hereunto set my hand this 14th day ofJanuary, 1904.

CAID H. PECK. Witnesses:

CHAS. KELLOGG, JOSEPH W. BEAMAN.

